June 3, 1992: The United Nations Conference on Environment and Development — the "Earth Summit" — opens in Rio de Janeiro, Brazil. Delegates agree on a Statement of Forest Principles, the United Nations Framework Convention on Climate Change and the United Nations Convention on Biological Diversity.

June 3, 2007: The strongest tropical cyclone ever recorded in the Arabian Sea nears land. Tropical Cyclone Gonu packs 150 mph winds. It weakens before making landfall in Iran, but flooding still takes roughly 80 lives in Iran and in the Arabian Peninsula.